You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
432 lines
20 KiB
HTML
432 lines
20 KiB
HTML
<!DOCTYPE html>
|
|
<html lang="en-US">
|
|
<head>
|
|
<meta charset="UTF-8">
|
|
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
|
|
<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
|
|
<script>
|
|
var gaProperty = 'UA-2577926-1';
|
|
// Disable tracking if the opt-out cookie exists.
|
|
var disableStr = 'ga-disable-' + gaProperty;
|
|
if (document.cookie.indexOf(disableStr + '=true') > -1) {
|
|
window[disableStr] = true;
|
|
}
|
|
function gaOptout() {
|
|
document.cookie = disableStr + '=true; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/';
|
|
window[disableStr] = true;
|
|
}
|
|
function gaOptoutRevoke() {
|
|
document.cookie = disableStr + '=false; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/';
|
|
window[disableStr] = false;
|
|
}
|
|
</script>
|
|
<!-- Global site tag (gtag.js) - Google Analytics -->
|
|
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-2577926-1"></script>
|
|
<script>
|
|
window.dataLayer = window.dataLayer || [];
|
|
function gtag(){dataLayer.push(arguments);}
|
|
gtag('js', new Date());
|
|
gtag('config', 'UA-2577926-1', { 'anonymize_ip': true });
|
|
</script>
|
|
<link rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.1.0/cookieconsent.min.css" />
|
|
<script src="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.1.0/cookieconsent.min.js"></script>
|
|
<script src="https://unpkg.com/lz-string@1.4.4/libs/lz-string.min.js"></script>
|
|
<script>
|
|
window.addEventListener("load", function() {
|
|
window.cookieconsent.initialise({
|
|
'palette': {
|
|
'popup': {
|
|
'background': '#eaf7f7',
|
|
'text': '#5c7291'
|
|
},
|
|
'button': {
|
|
'background': '#56cbdb',
|
|
'text': '#ffffff'
|
|
}
|
|
},
|
|
'theme': 'edgeless',
|
|
'type': 'opt-out',
|
|
'onInitialise': function (status) {
|
|
if (!this.hasConsented()) {
|
|
gaOptout()
|
|
}
|
|
},
|
|
'onStatusChange': function(status, chosenBefore) {
|
|
if (!this.hasConsented()) {
|
|
gaOptout()
|
|
}
|
|
},
|
|
'onRevokeChoice': function() {
|
|
gaOptoutRevoke()
|
|
}
|
|
})
|
|
});
|
|
</script>
|
|
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" type="text/css">
|
|
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" type="text/css">
|
|
<link rel="stylesheet" href="./resources/prism/prism-1.20.0.css" type="text/css">
|
|
<link rel="stylesheet" href="./css/ol.css" type="text/css">
|
|
<link rel="stylesheet" href="./resources/layout.css" type="text/css">
|
|
<script src="https://unpkg.com/elm-pep"></script>
|
|
<script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"></script>
|
|
<script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"></script>
|
|
|
|
<link rel="stylesheet" href="webgl-shaded-relief.css">
|
|
<title>Shaded Relief (with WebGL)</title>
|
|
</head>
|
|
<body>
|
|
|
|
<header class="navbar navbar-expand-sm navbar-dark mb-3 py-0" role="navigation">
|
|
<a class="navbar-brand" href="https://openlayers.org/"><img src="./resources/logo-70x70.png" alt=""> OpenLayers</a>
|
|
|
|
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#olmenu" aria-controls="olmenu" aria-expanded="false" aria-label="Toggle navigation">
|
|
<span class="navbar-toggler-icon"></span>
|
|
</button>
|
|
|
|
<!-- menu items that get hidden below 768px width -->
|
|
<nav class="collapse navbar-collapse" id="olmenu">
|
|
<ul class="nav navbar-nav ml-auto">
|
|
<li class="nav-item dropdown">
|
|
<a class="nav-link dropdown-toggle" href="#" id="docdropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Docs</a>
|
|
<div class="dropdown-menu dropdown-menu-right mb-3" aria-labelledby="docdropdown">
|
|
<a class="dropdown-item" href="../doc/">Docs</a>
|
|
<div class="dropdown-divider"></div>
|
|
<a class="dropdown-item" href="../doc/quickstart.html"><i class="fa fa-check fa-fw mr-2 fa-lg"></i>Quick Start</a>
|
|
<a class="dropdown-item" href="../doc/faq.html"><i class="fa fa-question fa-fw mr-2 fa-lg"></i>FAQ</a>
|
|
<a class="dropdown-item" href="../doc/tutorials/"><i class="fa fa-book fa-fw mr-2 fa-lg"></i>Tutorials</a>
|
|
<a class="dropdown-item" href="/workshop/"><i class="fa fa-graduation-cap fa-fw mr-2 fa-lg"></i>Workshop</a>
|
|
<div class="dropdown-divider"></div>
|
|
<a class="dropdown-item" href="https://stackoverflow.com/questions/tagged/openlayers"><i class="fa fa-stack-overflow fa-fw mr-2"></i>Ask a Question</a>
|
|
</div>
|
|
</li>
|
|
<li class="nav-item active"><a class="nav-link" href="../examples/">Examples</a></li>
|
|
<li class="nav-item"><a class="nav-link" href="../apidoc/"><i class="fa fa-sitemap mr-1"></i>API</a></li>
|
|
<li class="nav-item dropdown">
|
|
<a class="nav-link dropdown-toggle" href="#" id="codedropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Code</a>
|
|
<div class="dropdown-menu dropdown-menu-right mb-3" aria-labelledby="codedropdown">
|
|
<a class="dropdown-item" href="https://github.com/openlayers/openlayers"><i class="fa fa-github fa-fw mr-2 fa-lg"></i>Repository</a>
|
|
<a class="dropdown-item" href="/download/"><i class="fa fa-download fa-fw mr-2 fa-lg"></i>Download</a>
|
|
</div>
|
|
</li>
|
|
</ul>
|
|
</nav>
|
|
</header>
|
|
|
|
<div class="container-fluid line-numbers">
|
|
|
|
<div id="latest-check" class="alert alert-warning alert-dismissible" role="alert" style="display:none">
|
|
<button id="latest-dismiss" type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button>
|
|
This example uses OpenLayers v<span>6.12.0</span>. The <a id="latest-link" href="#" class="alert-link">latest</a> is v<span id="latest-version"></span>.
|
|
</div>
|
|
|
|
|
|
<div class="row-fluid">
|
|
<a href="#" id="codepen-button" class="btn btn-link float-right">
|
|
<i class="fa fa-codepen fa-lg"></i> Edit
|
|
</a>
|
|
<div class="span12">
|
|
<h4 id="title">Shaded Relief (with WebGL)</h4>
|
|
<p class="tags">
|
|
<span class="badge-group">
|
|
<a
|
|
href="./index.html?q=webgl" class="badge badge-info">webgl</a
|
|
><a
|
|
class="badge badge-info tag-modal-toggle text-white"
|
|
data-toggle="modal"
|
|
data-target="#tag-example-list"
|
|
data-title="webgl"
|
|
data-content="
|
|
<a class="list-group-item list-group-item-action" href="./cog-stretch.html">Band Contrast Stretch</a>
|
|
<a class="list-group-item list-group-item-action" href="./cog-style.html">Change Tile Layer Style</a>
|
|
<a class="list-group-item list-group-item-action" href="./heatmap-earthquakes.html">Earthquakes Heatmap</a>
|
|
<a class="list-group-item list-group-item-action" href="./filter-points-webgl.html">Filtering features with WebGL</a>
|
|
<a class="list-group-item list-group-item-action" href="./icon-sprite-webgl.html">Icon Sprites with WebGL</a>
|
|
<a class="list-group-item list-group-item-action" href="./webgl-layer-swipe.html">Layer Swipe (WebGL)</a>
|
|
<a class="list-group-item list-group-item-action" href="./numpytile.html">Rendering 16-bit NumpyTiles</a>
|
|
<a class="list-group-item list-group-item-action" href="./webgl-sea-level.html">Sea Level (with WebGL)</a>
|
|
<a class="list-group-item list-group-item-action active" href="./webgl-shaded-relief.html">Shaded Relief (with WebGL)</a>
|
|
<a class="list-group-item list-group-item-action" href="./webgl-points-layer.html">WebGL points layer</a>
|
|
<a class="list-group-item list-group-item-action" href="./webgl-tile-style.html">WebGL Tile Layer Styles</a>
|
|
<a class="list-group-item list-group-item-action" href="./webgl-tiles.html">WebGL Tiles</a>"
|
|
tabindex="0"
|
|
>12</a>
|
|
</span>
|
|
<span class="badge-group">
|
|
<a
|
|
href="./index.html?q=shadedrelief" class="badge badge-info">shadedrelief</a
|
|
><a
|
|
class="badge badge-info tag-modal-toggle text-white"
|
|
data-toggle="modal"
|
|
data-target="#tag-example-list"
|
|
data-title="shadedrelief"
|
|
data-content="
|
|
<a class="list-group-item list-group-item-action" href="./shaded-relief.html">Shaded Relief</a>
|
|
<a class="list-group-item list-group-item-action active" href="./webgl-shaded-relief.html">Shaded Relief (with WebGL)</a>"
|
|
tabindex="0"
|
|
>2</a>
|
|
</span>
|
|
</p>
|
|
<div class="modal modal-tag-example" id="tag-example-list" tabindex="-1" role="dialog" aria-labelledby="tag-example-title" aria-hidden="true">
|
|
<div class="modal-dialog modal-dialog-scrollable" role="document">
|
|
<div class="modal-content">
|
|
<div class="modal-header">
|
|
<h5 class="modal-title" id="tag-example-title"></h5>
|
|
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
|
|
<span aria-hidden="true">×</span>
|
|
</button>
|
|
</div>
|
|
<div class="modal-body">
|
|
<div class="list-group"></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="map" class="map"></div>
|
|
<table class="controls">
|
|
<tr>
|
|
<td><label for="vert">vertical exaggeration:</label></td>
|
|
<td><input id="vert" type="range" min="1" max="5" value="1"/></td>
|
|
<td><span id="vertOut"></span> x</td>
|
|
</tr>
|
|
<tr>
|
|
<td><label for="sunEl">sun elevation:</label></td>
|
|
<td><input id="sunEl" type="range" min="0" max="90" value="45"/></td>
|
|
<td><span id="sunElOut"></span> °</td>
|
|
</tr>
|
|
<tr>
|
|
<td><label for="sunAz">sun azimuth:</label></td>
|
|
<td><input id="sunAz" type="range" min="0" max="360" value="45"/></td>
|
|
<td><span id="sunAzOut"></span> °</td>
|
|
</tr>
|
|
</table>
|
|
|
|
</div>
|
|
<form method="POST" id="codepen-form" target="_blank" action="https://codesandbox.io/api/v1/sandboxes/define">
|
|
<input id="codesandbox-params" type="hidden" name="parameters">
|
|
</form>
|
|
</div>
|
|
|
|
<div class="row-fluid">
|
|
<div class="span12">
|
|
<p id="shortdesc">Calculate shaded relief from elevation data</p>
|
|
<div id="docs"><p>
|
|
For the shaded relief, a single tiled source of elevation data is used as input.
|
|
The shaded relief is calculated by the layer's <code>style</code> with a <code>color</code>
|
|
expression. The style variables are updated when the user drags one of the sliders. The
|
|
<code>band</code> operator is used to sample data from neighboring pixels for calculating slope and
|
|
aspect, which is done with the <code>['band', bandIndex, xOffset, yOffset]</code> syntax.
|
|
</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div class="row-fluid">
|
|
<h5 class="source-heading">main.js</h5>
|
|
<pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
|
|
import Map from 'ol/Map';
|
|
import View from 'ol/View';
|
|
import {OSM, XYZ} from 'ol/source';
|
|
import {WebGLTile as TileLayer} from 'ol/layer';
|
|
|
|
const variables = {};
|
|
|
|
// The method used to extract elevations from the DEM.
|
|
// In this case the format used is
|
|
// red + green * 2 + blue * 3
|
|
//
|
|
// Other frequently used methods include the Mapbox format
|
|
// (red * 256 * 256 + green * 256 + blue) * 0.1 - 10000
|
|
// and the Terrarium format
|
|
// (red * 256 + green + blue / 256) - 32768
|
|
function elevation(xOffset, yOffset) {
|
|
return [
|
|
'+',
|
|
['*', 256, ['band', 1, xOffset, yOffset]],
|
|
[
|
|
'+',
|
|
['*', 2 * 256, ['band', 2, xOffset, yOffset]],
|
|
['*', 3 * 256, ['band', 3, xOffset, yOffset]],
|
|
],
|
|
];
|
|
}
|
|
|
|
// Generates a shaded relief image given elevation data. Uses a 3x3
|
|
// neighborhood for determining slope and aspect.
|
|
const dp = ['*', 2, ['resolution']];
|
|
const z0x = ['*', ['var', 'vert'], elevation(-1, 0)];
|
|
const z1x = ['*', ['var', 'vert'], elevation(1, 0)];
|
|
const dzdx = ['/', ['-', z1x, z0x], dp];
|
|
const z0y = ['*', ['var', 'vert'], elevation(0, -1)];
|
|
const z1y = ['*', ['var', 'vert'], elevation(0, 1)];
|
|
const dzdy = ['/', ['-', z1y, z0y], dp];
|
|
const slope = ['atan', ['^', ['+', ['^', dzdx, 2], ['^', dzdy, 2]], 0.5]];
|
|
const aspect = ['clamp', ['atan', ['-', 0, dzdx], dzdy], -Math.PI, Math.PI];
|
|
const sunEl = ['*', Math.PI / 180, ['var', 'sunEl']];
|
|
const sunAz = ['*', Math.PI / 180, ['var', 'sunAz']];
|
|
|
|
const cosIncidence = [
|
|
'+',
|
|
['*', ['sin', sunEl], ['cos', slope]],
|
|
['*', ['*', ['cos', sunEl], ['sin', slope]], ['cos', ['-', sunAz, aspect]]],
|
|
];
|
|
const scaled = ['*', 255, cosIncidence];
|
|
|
|
const shadedRelief = new TileLayer({
|
|
opacity: 0.3,
|
|
source: new XYZ({
|
|
url: 'https://{a-d}.tiles.mapbox.com/v3/aj.sf-dem/{z}/{x}/{y}.png',
|
|
}),
|
|
style: {
|
|
variables: variables,
|
|
color: ['color', scaled, scaled, scaled],
|
|
},
|
|
});
|
|
|
|
const controlIds = ['vert', 'sunEl', 'sunAz'];
|
|
controlIds.forEach(function (id) {
|
|
const control = document.getElementById(id);
|
|
const output = document.getElementById(id + 'Out');
|
|
function updateValues() {
|
|
output.innerText = control.value;
|
|
variables[id] = Number(control.value);
|
|
}
|
|
updateValues();
|
|
const listener = function () {
|
|
updateValues();
|
|
shadedRelief.updateStyleVariables(variables);
|
|
};
|
|
control.addEventListener('input', listener);
|
|
control.addEventListener('change', listener);
|
|
});
|
|
|
|
const map = new Map({
|
|
target: 'map',
|
|
layers: [
|
|
new TileLayer({
|
|
source: new OSM(),
|
|
}),
|
|
shadedRelief,
|
|
],
|
|
view: new View({
|
|
extent: [-13675026, 4439648, -13580856, 4580292],
|
|
center: [-13615645, 4497969],
|
|
minZoom: 10,
|
|
maxZoom: 16,
|
|
zoom: 13,
|
|
}),
|
|
});
|
|
</code></pre>
|
|
</div>
|
|
|
|
<div class="row-fluid">
|
|
<h5 class="source-heading">index.html</h5>
|
|
<pre><code id="example-html-source" class="language-markup"><!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<meta charset="UTF-8">
|
|
<title>Shaded Relief (with WebGL)</title>
|
|
<!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
|
|
<script src="https://unpkg.com/elm-pep"></script>
|
|
<!-- The lines below are only needed for old environments like Internet Explorer and Android 4.x -->
|
|
<script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"></script>
|
|
<script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"></script>
|
|
<style>
|
|
.map {
|
|
width: 100%;
|
|
height:400px;
|
|
}
|
|
table.controls td {
|
|
padding: 2px 5px;
|
|
}
|
|
table.controls td:nth-child(3) {
|
|
text-align: right;
|
|
min-width: 3em;
|
|
}
|
|
</style>
|
|
</head>
|
|
<body>
|
|
<div id="map" class="map"></div>
|
|
<table class="controls">
|
|
<tr>
|
|
<td><label for="vert">vertical exaggeration:</label></td>
|
|
<td><input id="vert" type="range" min="1" max="5" value="1"/></td>
|
|
<td><span id="vertOut"></span> x</td>
|
|
</tr>
|
|
<tr>
|
|
<td><label for="sunEl">sun elevation:</label></td>
|
|
<td><input id="sunEl" type="range" min="0" max="90" value="45"/></td>
|
|
<td><span id="sunElOut"></span> °</td>
|
|
</tr>
|
|
<tr>
|
|
<td><label for="sunAz">sun azimuth:</label></td>
|
|
<td><input id="sunAz" type="range" min="0" max="360" value="45"/></td>
|
|
<td><span id="sunAzOut"></span> °</td>
|
|
</tr>
|
|
</table>
|
|
<script src="main.js"></script>
|
|
</body>
|
|
</html></code></pre>
|
|
</div>
|
|
|
|
<div class="row-fluid">
|
|
<h5 class="source-heading">package.json</h5>
|
|
<pre><code id="example-pkg-source" class="language-json">{
|
|
"name": "webgl-shaded-relief",
|
|
"dependencies": {
|
|
"ol": "6.12.0"
|
|
},
|
|
"devDependencies": {
|
|
"parcel": "^2.0.0"
|
|
},
|
|
"scripts": {
|
|
"start": "parcel index.html",
|
|
"build": "parcel build --public-url . index.html"
|
|
}
|
|
}</code></pre>
|
|
</div>
|
|
</div>
|
|
|
|
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
|
|
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.bundle.min.js"></script>
|
|
<script src="./resources/prism/prism-1.20.0.min.js"></script>
|
|
<script src="./resources/common.js"></script>
|
|
<script src="common.js"></script>
|
|
<script src="webgl-shaded-relief.js"></script>
|
|
<script>
|
|
$('#tag-example-list').on('show.bs.modal', function (event) {
|
|
const button = $(event.relatedTarget); // Button that triggered the modal
|
|
const title = button.data('title');
|
|
const content = button.data('content');
|
|
const modal = $(this)
|
|
modal.find('.modal-title').text(title);
|
|
modal.find('.modal-body').html(content);
|
|
});
|
|
|
|
var packageUrl = 'https://raw.githubusercontent.com/openlayers/openlayers.github.io/build/package.json';
|
|
fetch(packageUrl).then(function(response) {
|
|
return response.json();
|
|
}).then(function(json) {
|
|
var latestVersion = json.version;
|
|
document.getElementById('latest-version').innerHTML = latestVersion;
|
|
var url = window.location.href;
|
|
var branchSearch = url.match(/\/([^\/]*)\/examples\//);
|
|
var cookieText = 'dismissed=-' + latestVersion + '-';
|
|
var dismissed = document.cookie.indexOf(cookieText) != -1;
|
|
if (branchSearch && !dismissed && /^v[0-9\.]*$/.test(branchSearch[1]) && '6.12.0' != latestVersion) {
|
|
var link = url.replace(branchSearch[0], '/latest/examples/');
|
|
fetch(link, {method: 'head'}).then(function(response) {
|
|
var a = document.getElementById('latest-link');
|
|
a.href = response.status == 200 ? link : '../../latest/examples/';
|
|
});
|
|
var latestCheck = document.getElementById('latest-check');
|
|
latestCheck.style.display = '';
|
|
document.getElementById('latest-dismiss').onclick = function() {
|
|
latestCheck.style.display = 'none';
|
|
document.cookie = cookieText;
|
|
}
|
|
}
|
|
});
|
|
</script>
|
|
</body>
|
|
</html>
|